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199.

A 220 V, 20 A, 1000 rpm, separately excited dc motor has an armature resistance of 2.5Ω. The motor is controlled by a step down chopper with a frequency of 1 kHz. The input dc voltage to the chopper is 250 V The duty cycle of the chopper for the motor to operate at a speed of 600 rpm delivering the rated torque will be [2 marks]
(A) 0.518
(B) 0.608
(C) 0.852
(D) 0.902

asked in Electrical Engineering, 2008

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200.

A single-phase half controlled converter shown in the figure is feeding power to highly inductive load.
The converter is operating at a firing angle of 60°.

If the firing pulses are suddenly removed, the steady state voltage (v_o) waveform of the converter will become [2 marks]

asked in Electrical Engineering, 2008

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201.

A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current. If the triggering angle is 30°, the input power factor will be [2 marks]
(A) 0.65
(B) 0.78
(C) 0.85
(D) 0.866

asked in Electrical Engineering, 2008

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202.

Single line diagram of a 4-bus single source distribution system is shown below. Branches e₁, e₂, e₃, and e₄ have equal impedances. The load current values indicated in the figure are in per unit. Distribution company's policy requires radial system operation with minimum loss. This can be achieved by opening of the branch

[2 marks]
(A) e
(B) e₂
(C) e₃
(D) e₄

asked in Electrical Engineering, 2008

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203.

A lossless single machine infinite bus power system is shown below

The synchronous generator transfers 1.0 per unit of power to the infinite bus. Critical clearing time of circuit breaker is 0.28 s. If another identical sycnchronous generator is connected in parallel to the existing generator and each generator is scheduled to supply 0.5 per unit of power. Then the critical clearing time of the circuit breaker will [2 marks]
(A) reduce to 0.14 s
(B) reduce but will be more than 0.14 s
(C) remain constant 0.28s
(D) increase beyond 0.28 s

asked in Electrical Engineering, 2008

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204.

A lossless power system has to serve a load of 250 MW. There are two generators (G₁ and G₂) in the system with cost curves C₁ and C₂ respectively defined as follows
C₁(P_G1) = P_G1 + 0.055 (P_G1)²
C₂(P_G2) = 3P_G2 + 0.03 (P_G2)²
where P_G1 and P_G2 are the MW injections from generator G₁ and G₂ respectively. Then the minimum cost dispatch will be [2 marks]
(A) P_G1 = 250 MW; P_G2 = 0 MW
(B) P_G1 = 150 MW; P_G2 = 100 MW
(C) P_G1 = 100 MW: P_G2 = 150 MW
(D) P_G1 = 0 MW; P_G2 = 250 MW

asked in Electrical Engineering, 2008

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